*3.4. Protection Schemes*

In addition to the control and regulation characteristics, the aspects of protection schemes should also be considered. Table 1 consists of the over/under voltage and over/under frequency protection schemes at the connection point of DERs that are connected to an LV electrical network. The schemes are required by the DSO in selected European countries on the basis of References [52,56].


**Table 1.** Over/under voltage and over/under frequency protection schemes at the connection point of DERs connected to a LV electrical network in selected European countries.
